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Co/Co_(7)Fe_(3)heterostructures with controllable alloying degree on carbon spheres as bifunctional electrocatalyst forrechargeable zinc-air batteries

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 476-487页

作者： Junkang Chen Yongyue Zhuang Yanxin Qiao yu Zhang Aihua yuan Hu Zhou School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

Exploring efficient and nonprecious metal electrocatalysts of oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is crucial for developing rechargeable zinc-air batteries(ZABs).Herein,an alloying-degree control strategy was employed to fabricate nitrogen-doped carbon sphere(NCS)decorated with dual-phase Co/Co_(7)Fe_(3)heterojunctions(CoFe@NCS).The phase composition of materials has been adjusted by controlling the alloying *** optimal CoFe_(0.08)@NCS electrocatalyst displays a half-wave potential of 0.80 v for ORR and an overpotential of 283 mv at 10 mA·cm^(-2)for OER in an alkaline *** intriguing bifunctional electrocatalytic activity and durability is attributed to the hierarchically porous structure and interfacial electron coupling of highly-active Co_(7)Fe_(3)alloy and metallic Co *** the CoFe_(0.08)@NCS material is used as air-cathode catalyst of rechargeable liquid-state zinc-air battery(ZAB),the device shows a high peak power-density(157 mW·cm^(-2))and maintains a stable voltage gap over 150 h,outperforming those of the benchmark(Pt/C+RuO_(2))-based *** particular,the as-fabricated solid-state flexible ZAB delivers a reliable compatibility under different bending *** work provides a promising strategy to develop metal/alloy-based electrocatalysts for the application in renewable energy conversion technologies.

关键词： bifunctional electrocatalysts oxygen reduction reaction oxygen evolution reaction zinc-air battery metal/alloy carbon sphere

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First-principle investigation on mechanism of Ca ion activating flotation of spodumene

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Rare Metals 2014年第3期33卷 358-362页

作者： fu-Shun yu yu-Hua Wang Jin-Ming Wang Zhen-fu Xie Lei Zhang School of Minerals Processing and Bioengineering Central South University

Different hypotheses of the activation mechanisms of metallic ions for silicate minerals flotation were stated in this work. Spodumene and Ca ion were taken to illustrate this issue. Flotation test results and diagram of Ca ion species distribution vs pH show that the dominant hydrolyzed species are Ca（OH）？and Ca（OH）2, which is in correspondence with the maximum flotation recovery of spodumene. Density functional theory（DFT） calculation results reveal further that the precipitation of calcium hydroxide on spodumene surface is the effective process to activate the flotation of spodumene.

关键词： Spodumene flotation Ca ion Activationmechanism Density functional theory calculation

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Microstructure Study of Photoluminescent Porous Silicon

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Chinese Physics Letters 1996年第1期13卷 35-38页

作者： WENG yu-min ZONG Xiang-fu Materials Science Institute Fudan UniversityShanghai 200433

We have studied the microstructure and photoluminescent properties of porous *** resolution observations revealed that the microstructure of porous Si consists with nano-crystaliites Si embedded in the surrounding amorphous *** struc-ture of nano-crystallites of porous Si is not consis tent with the usual diamond struc-ture of bulk *** photoluminescence from porous Si is due to the quantum com finement of carriers in this structure.

关键词： porous struc microstructure

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fuzzy Zorn’s lemma with applications

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Applied Mathematics(A Journal of Chinese Universities) 2021年第4期36卷 521-536页

作者： XIN Xiao-long fu yu-long School of Science Xi’an Polytechnic UniversityXi’an 710048China School of Mathematics Northwest UniversityXi’an 710127China School of Cyber Engineering Xidian UniversityXi’an 710071China

We introduced the fuzzy axioms of choice,fuzzy Zorn’s lemma and fuzzy well-ordering principle,which are the fuzzy versions of the axioms of choice,Zorn’s lemma and well-ordering principle,and discussed the relations among *** an application of fuzzy Zorn’s lemma,we got the following results:(1)Every proper fuzzy ideal of a ring was contained in a maximal fuzzy ideal.(2)Every nonzero ring contained a fuzzy maximal ideal.(3)Introduced the notion of fuzzy nilpotent elements in a ring R,and proved that the intersection of all fuzzy prime ideals in a commutative ring R is the union of all fuzzy nilpotent elements in R.(4)Proposed the fuzzy version of Tychonoff Theorem and by use of fuzzy Zorn’s lemma,we proved the fuzzy Tychonoff Theorem.

关键词： fuzzy axioms of choice fuzzy Zorn’s lemma fuzzy well-ordering principle fuzzy ideal of a ring fuzzy Tychonoff Theorem

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Stabilizing model predictive control scheme for piecewise affine systems with maximal positively invariant terminal set

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Journal of Systems Engineering and Electronics 2010年第6期21卷 1090-1094页

作者： fu Chen Guangzhou Zhao Xiaoming yu College of System Science and Engineering Zhejiang University Hangzhou 310027 P. R. China Key Laboratory of Tobacco Processing Technology Zhengzhou Tobacco Research Institute of CNTC Zhengzhou 450001 P. R. China

An efficient algorithm is proposed for computing the solution to the constrained finite time optimal control （CFTOC） problem for discrete-time piecewise affine （PWA） systems with a quadratic performance index. The maximal positively invariant terminal set, which is feasible and invariant with respect to a feedback control law, is computed as terminal target set and an associated Lyapunov.function is chosen as terminal cost. The combination of these two components guarantees constraint satisfaction and closed-loop stability for all time. The proposed algorithm combines a dynamic programming strategy with a multi-parametric quadratic programming solver and basic polyhedral manipulation. A numerical example shows that a larger stabilizable set of states can be obtained by the proposed algorithm than precious work.

关键词： constrained optimal predictive control multi-parametric quadratic programming dynamic programming receding horizon control positively invariant set.

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On Cost Minimization for Cache-Enabled D2D Networks with Recommendation

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China Communications 2022年第11期19卷 257-267页

作者： yu Hua Yaru fu Qi Zhu The Key Wireless Laboratory of Jiangsu Province Nanjing University of Posts and TelecommunicationsNanjing 210003China School of Science and Technology Hong Kong Metropolitan UniversityHong Kong 999077China

To accommodate the tremendous increase of mobile data traffic,cache-enabled device-to-device(D2D)communication has been taken as a promising technique to release the heavy burden of cellular networks since popular contents can be pre-fetched at user devices and shared among *** a result,cellular traffic can be offloaded and an enhanced system performance can be ***,due to the limited cache capacity of mobile devices and the heterogeneous preferences among different users,the requested contents are most likely not be proactively cached,inducing lower cache hit *** system,on the other hand,is able to reshape users’request schema,mitigating the heterogeneity to some extent,and hence it can boost the gain of edge *** this paper,the cost minimization problem for the social-aware cache-enabled D2D networks with recommendation consideration is investigated,taking into account the constraints on the cache capacity budget and the total number of recommended files per user,in which the contents are sharing between the users that trust each *** minimization problem is an integer non-convex and non-linear programming,which is in general ***,we propose a timeefficient joint recommendation and caching decision *** simulation results show that the proposed scheme converges quickly and significantly reduces the average cost when compared with various benchmark strategies.

关键词： edge caching cost minimization D2D communication recommendation systems

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Identifying and Quantifying Pixel-Level Uncertainty among Major Satellite Derived Global Land Cover Products

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Journal of Meteorological Research 2020年第4期34卷 806-821页

作者： Hao GAO Gensuo JIA yu fu National Satellite Meteorological Center China Meteorological AdministrationBeijing 100081 Key Laboratory of Regional Climate–Environment for Temperate East Asia(RCE-TEA) Chinese Academy of SciencesBeijing 100029 Climate Change Research Center Chinese Academy of SciencesBeijing 100029

Accurate global land cover(GLC), as a key input for scientific communities, is important for a wide variety of applications. In order to understand the current suitability and limitation of GLC products, the discrepancy and pixellevel uncertainty in major GLC products in three epochs are assessed in this study by using an integrated uncertainty index(IUI) that combines the thematic uncertainty and local classification accuracy uncertainty. The results show that the overall spatial agreements(Ao values) between GLC products are lower than 58%, and the total areas of forests are very consistent in major GLC products, but significant differences are found in different forest *** misclassification among different forest classes and mosaic types can account for about 20% of the total disagreements. The mean IUI almost reaches 0.5, and high uncertainty mostly occurs in transition zones and heterogeneous areas across the world. further efforts are needed to make in the land cover classifications in areas with high uncertainty. Designing a classification scheme for climate models, with explicit definitions of land cover classes in the threshold of common attributes, is urgently needed. Information of the pixel-level uncertainty in major GLC products not only give important implications for the specific application, but also provide a quite important basis for land cover fusion.

关键词： global land cover(GLC) discrepancies thematic similarity local accuracy pixel-level uncertainty

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Sampled-data Observer Design for a Class of Stochastic Nonlinear Systems Based on the Approximate Discrete-time Models

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IEEE/CAA Journal of Automatica Sinica 2017年第3期4卷 507-511页

作者： Xinxin fu yu Kang Pengfei Li Department of Automation University of Science and Technology of China State Key Laboratory of Fire Science Department of AutomationInstitute of Advanced TechnologyUniversity of Science and Technology of China Key Laboratory of Technology in GeoSpatial Information Processing and Application System Chinese Academy of Sciences IEEE

In this paper,we studied the approximate sampleddata observer design for a class of stochastic nonlinear ***-Maruyama approximation was investigated in this paper because it is the basis of other higher precision numerical methods,and it preserves important structures of the nonlinear ***,the form of Euler-Maruyama model is simple and easy to be *** results provide a reference for sampled-data observer design method for such stochastic nonlinear systems,and may be useful to many practical control applications,such as tracking control in mechanical *** the effectiveness of the approach is demonstrated by a simulation example.

关键词： Approximation model exponentially bounded sampled-data observer stochastic nonlinear

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On Counting Certain Abelian varieties Over Finite Fields

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Acta Mathematica Sinica,English Series 2021年第1期37卷 205-228页

作者： Jiang Wei XUE Chia fu yu Collaborative Innovation Center of Mathematics School of Mathematics and StatisticsWuhan UniversityWuhan 430072P.R.China Institute of Mathematics Academia Sinica and NCTS6th FloorAstronomy Mathematics BuildingNo.1Roosevelt Rd.Sec.4Taipei 10617TaiwanChina

This paper contains two parts toward studying abelian varieties from the classification point of *** a series of papers[***.,21,1607–1643(2016)],[Taiwan Residents ***.,20(4),723–741(2016)],etc.,the current authors and *** obtain explicit formulas for the numbers of superspecial abelian surfaces over finite *** this paper,we give an explicit formula for the size of the isogeny class of simple abelian surfaces with real Weil number q1/*** establishes a key step that extends our previous explicit calculation of superspecial abelian surfaces to those of supersingular abelian *** second part is to introduce the notion of genera and idealcomplexes of abelian varieties with additional structures in a general *** purpose is to generalize the previous work by the second named author[Forum Math.,22(3),565–582(2010)]on abelian varieties with additional structures to similitude classes,which establishes more results on the connection between geometrically defined and arithmetically defined masses for further investigations.

关键词： Mass formula abelian varieties over finite fields

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Mapping the Spinless Fermion-Boson Model onto a Luttinger Liquid Model

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Chinese Physics Letters 1996年第11期13卷 801-804页

作者： WANG yu-peng PU fu-ke Cryogenic Laboratory Chinese Academy of SciencesBeijing 100080 Department of Physics Guangzhou Teacher’s CollegeGuangzhou 510400 Institute of Physics Chinese Academy of SciencesBeijing 100080

The spinless fermion-boson model in one-dimension is studied via the Bethe ansatz *** eigenstates of the model Hamiltonian are *** long distance correlation functions are calculated based on the prediction of the conformal field *** is shown that the low energy physics of the present model is equivalent to that of a Luttinger liquid model.

关键词： theory method Fermi

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